It's Shark Week! And people who've been maimed and severely injured by sharks are doing the absolute last thing you'd expect them to be doing. Plus five shows are heading for their explosive season finales, including Falling Skies. Tonight sees the return of Grimm, featuring the great James Frain! Adventure Time is having what might be its trippiest episode yet. Finally, all of Doctor Who's temporal shenanigans will make perfect sense!

Check out a ton of clips and promos below...

Top image: Ryan Pierse/Getty Images.

Today:

Adventure Time (7:30 PM, Cartoon Network):
In "King Worm," Finn has a really, really weird dream, and all of Ooo is in it... but is it just a dream? (I think that "King Worm" title might be a wee hint, actually.) Check out a clip! This is followed by your usual mix of Regular Show, Mad and stuff.

Sharkzilla (9 PM, Discovery):
Yes, it's Shark Week! Finally, a reason to keep living. And we're kicking off in style, with a tribute to Bootsy Collins Godzilla. Apparently Sharkzilla is "The Nightmarish Megalodon."

Tyrannosaurus rex is widely considered the king of the apex predators, but it wouldn't have had a chance against the mighty Megalodon.

This is followed at 10PM by Mythbusters: Jawsome Shark Special.

Warehouse 13 (9 PM, Syfy):
We're finally starting to get into the swing of the storyline about both Claudia and Artie facing up to the consequences of their use of artifacts to save the people they care about, in an episode called "There's Always a Downside." Plus meanwhile, there's a sudden outbreak of geniuses at an East Coast prep school, where Hugo Miller's nephew is a student. Pete and Claudia check out the school, while Myka and Steve search for a different artifact in New Orleans. Check out a clip!

Grimm (10 PM, NBC):
Weirdly, the fall season of Grimm is starting way early, with a few episodes airing in August to whet your appetite. Tonight: "Bad Teeth," featuring James Frain!

A FOREIGN AGENDA TO HUNT DOWN NICK IS REVEALED AS THE BODY COUNT IN PORTLAND RISES —BRIAN TEE, JAMES FRAIN AND MARY ELIZABETH MASTRANTONIO GUEST STAR — After their face-off with Kimura (guest star Brian Tee), Nick (David Giuntoli) finds himself trying to come to grips with the return of his mother, Kelly Burkhardt (guest star Mary Elizabeth Mastrantonio). A trail of brutal murders unveils a foreign conspiracy to hunt down Nick, leading to several revelations about his past. Meanwhile, Juliette (Bitsie Tulloch) still lies in her mysteriously-induced coma as Rosalee (Bree Turner) and Monroe (Silas Weir Mitchell) work tirelessly to bring her out of it safely. Elsewhere, Hank (Russell Hornsby) struggles with the shocking truths he's recently seen and Captain Renard (Sasha Roiz) deals with unexpected family issues when his estranged brother (guest star James Frain) comes back into his life.

Teen Wolf (10 PM, MTV):
It's the season finale, "Master Plan."

The time is ticking as Scott tries to find out Gerard's master plan following a death on campus.

This is followed by Teen Wolf: Revelations, a special wrap-up.

Alphas (10 PM, Syfy):
Here's what's up in "When Push Comes to Shove":

The team discover that the alpha they're hunting is their missing teammate, Nina, whose powers are going out of control.

Also on TV tonight: Cartoon Network is continuing to burn off new episodes of Scooby-Doo: Mystery Incorporated at 2 in the afternoon.

Tuesday:

Level Up (8 PM, Cartoon Network):
In the latest episode, Lyle is feeling under-appreciated, so he decides to go over to the Dark Side... and join forces with one of the video game villains that's leaked out into the real world. It's nice to see Cartoon Network continuing to do live-action shows, but I still miss Tower Prep.

How Jaws Changed the World (9 PM, Discovery):
Shark Week continues! And we're looking at the legacy of the most famous shark of them all. This is followed at 10 PM by Adrift: 47 Days With Sharks.

Also on TV tonight: Cartoon Network has another new Scooby-Doo: Mystery Incorporated at 2 PM. Later, at 7 PM, they have a new Amazing World of Gumball, and then at 7:30 there's a new Total Drama.

Wednesday:

Shark Fight (9 PM, Discovery):
No, it's not about fighting against sharks, or sharks fighting each other. It's about fighting for sharks. According to the Orlando Sentinel:

The documentary explains how many survivors of shark attacks have become advocates for the creatures. Those survivors include Al Brenneka, who lost his right arm after an attack at Delray Beach, and Mike Coots, who lost a leg in an attack while surfing in Hawaii. "Shark Fight" also features harrowing re-enactments of the attacks.

Former Sentinel reporter Debbie Salamone embodies the theme of "Shark Attack." A shark severed her Achilles tendon about 10 years ago. She came up with the idea of creating Shark Attack Survivors for Shark Conservation and recruited people from around the world beginning in 2009.

This is followed by World's Scariest Animal Attacks.

Futurama (10 PM, Comedy Central):
Turns out there are more members of Fry and the Professor's family still kicking around than we realized. In "Near-Death Wish," it turns out Professor Farnsworth's family is alive!

When the Professor learns that his parents are coming out of virtual retirement from the Near-Death Star, he becomes upset.

Also on TV tonight: Still another new Scooby-Doo on Cartoon Network at 2 PM. Then there's the season finale of Johnny Test on Cartoon Network at 7:30, followed by a new Ninjago: Masters of Spinjitsu at 8 PM.

Thursday:

Great White Highway (9 PM, Discovery):
According to Discovery, "The Pacific Ocean is like a Blue Serengeti, teaming with wildlife, great migrations and sharks. Very big sharks." This is followed by Shark Week's 25 Best Bites, celebrating 25 years of Shark Week.

Saving Hope (9 PM, NBC):
Now that the Olympics are over, your favorite medical soap opera with coma ghosts and lens flare is back! And this time around, Joel the cocky surgeon has broken his hand, which is kind of a bummer:

With Charlie removed from his ventilator, all he and Alex can do is wait and ask themselves: is this really it? But when a patient comes in for a routine follow-up, her new symptoms could lead Alex and Charlie to making a discovery about Charlie's coma. Meanwhile, Joel cannot operate after breaking his hand, and Maggie and Gavin deal with the aftermath of their kiss.

Misfits (10 PM, LOGO):
Here's what to expect from episode five:

Determined to prove that the gang were involved in Tony's disappearance, Sally focuses her investigation on Simon. Meanwhile, Nathan becomes strangely infatuated with a baby he finds at the community center.

Also on TV tonight: Once again, Cartoon Network has a brand new Scooby-Doo at 2 PM ("Wrath of the Krampus".) Plus there's a brand new Wilfred on FX at 10 PM.

Friday:

Gravity Falls (9:30 PM, Disney)
Another chance to find out why people are so excited about this brand new cartoon about two crazy kids in a weird town full of insane discoveries:

"Irrational Treasure" - When Dipper and Mabel discover evidence that the reported town founder is a hoax, they set out to expose the historical cover-up and prove that Mabel's silliness is not a bad thing.

Trick and Kenzi try to save Bo from the fallout of a steamy night gone wrong; Bo asks Trick uncomfortable questions about her origins.

Chasing UFOs (10 PM, National Geographic):
It's the season finale, "Alien Baby Farm." I love visiting the farm and seeing the newborn aliens in their enclosures. They're so cute at that age.

Also on TV tonight: Yet again, Cartoon Network has a brand new Scooby-Doo at 2 PM.

Saturday:

Timey Wimey Stuff of Doctor Who (9 PM, BBC America):
In case you're still getting up to speed on the show before it comes back in a few weeks, here's a chance to familiarize yourself with Doctor Who's penchant for zany time travel hijinks and stuff.

If time travel were possible, says speculative astrophysicist Carl Sagan, "history would become an experimental science." The subject is so complex and compelling, it gets its own special treatment from BBC America. The special takes its name from series 3 episode "Blink," wherein the tenth Doctor describes time as "a big ball of wibbly, wobbly, timey, wimey stuff," and that "stuff" has made decades of adventure possible for the Doctor and his companions. But what is possible for all of us? What happens to humanity if we start experimenting with our own history? Scientists and Whovians of all stripes tackle these questions in The Timey Wimey Stuff of Doctor Who.

This is followed by The Nerdist's "tribute to time travel."

Dark Matters: Twisted But True (10 PM, Science):
It's the season finale, and we're going out in style — with bat-bombs!

The story of the Stanford Prison Experiment. A doctor experiments with cocaine. Millions of bats are used to bomb Japan.

Sunday:

Ultimate Spider-Man/Avengers: Earth's Mightiest Heroes (11 AM, Disney XD):
Apparently the episodes we told you were running last week, the ones about Damage Control and Ultron respectively, are airing this week instead of last week. Sorry about that — there seems to have been a last-minute change-up.

Falling Skies (9 PM, TNT):
It's the season finale, "A More Perfect Union," and apparently this is the big blow-out action episode you've been waiting all season for. Here's the skinny:

When skitters approach the newly combined resistance force, the groups' interaction surprises everyone. Meanwhile, Tom finds out life-changing news just as the 2nd Mass comes face-to-face with their most dangerous threat to date.

True Blood (9 PM, HBO):
It's the penultimate episode of the season! Here's what happens in "Song of the Dead Faerie":

Slipping further into religious fervor, Bill gives Jessica an order she's loath to carry out. Armed with a damning video of Russell and Steve, the military delivers an ultimatum to the Authority. Claude and Maurella take Sookie to meet the faerie elder, who may know something about an ancient family secret. Alcide reconnects with his father; Sam and Luna hitch a ride into the Authority.

Breaking Bad (10 PM, AMC):
Here's what to expect in "Buyout":

Walt, Jesse, and Mike struggle over the future of their business, as occupational hazards weigh on Jesse.

Also on TV tonight: There's a new Leverage on TNT at 8 PM. Adult Swim has Black Dynamite at 11:30 PM, followed by a new Aqua Teen Hunger Force at midnight and Squid-Billies at 12:15.